On Mon, Dec 25 2017, Gandalf Corvotempesta wrote: > Hi to all > I have a server with a 3way mirror. > As I have to increase the total available space, one solution would be to > replace all disks with bigger ones, but this is expensive. > > Another solution would be to add just one disk and then reshape from > RAID-1 to RAID-6 > > Do you have any guide on how to do this reshape on a running array ? > Thank you. I suggest you add the new device with "mdadm --add", then try the reshape with "mdadm --grow /dev/mdXXX --level=6 --raid-devices-4". It might not work quite that easily - I think you need to first convert the raid1 to a 2-way mirror, but that is easy enough mdadm --grow /dev/mdxxx --raid-devices=2 NeilBrown
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